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Score : $100$ points

### Problem Statement

Takahashi wants to print a document with $N$ pages double-sided, where two pages of data can be printed on one sheet of paper.

At least how many sheets of paper does he need?

### Constraints

• $N$ is an integer.
• $1 \leq N \leq 100$

### Input

Input is given from Standard Input in the following format:

$N$


### Sample Input 1

5


### Sample Output 1

3


By printing the $1$-st, $2$-nd pages on the $1$-st sheet, $3$-rd and $4$-th pages on the $2$-nd sheet, and $5$-th page on the $3$-rd sheet, we can print all the data on $3$ sheets of paper.

### Sample Input 2

2


### Sample Output 2

1


### Sample Input 3

100


### Sample Output 3

50